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UNITED STATES PATENT @Erica MARTIN HERZBERG, OF ELBERFELD, GERMANY, ASSIGNOR TO THE FAR- BENFABRIKEN, VOR-MALS FR. BAYER & COMPANY, OF SAME PLACE.

MANUFACTURE OF DYE-STUFFS.

SPEUIFICATIQN forming part of Letters Patent No, 384,315, dated June 12, 1888.

Application filed February 2!, 1888. Serial No. 264.831.

To a'ZZ 2117mm it may concern:

Be it known that I, MARTIN HERZBERG, doctor olphilosophy, a subject of the Emperor of Germany, residing at Elberfeld, Prussia, Germany, assignor to the Farbenfabriken, vormals Fr. Bayer &- Company, have invented new and useful Improvements in the Manufacture oi'DyeStnffs orColoring-Matters,ofwhich the following is aspccitication.

This invention relates to the manufacture of new brown coloring-matters for dyeing cotton, wool, and silk by combining diazo or tetrazo compounds with dyestuffs well known in commerce under the name of Bismarck brown, (triamidoazo-benzol or triamidoazotoluol.) These dyes are obtained, according to this invention, by causing an aqueous solution oi the diazo or tctraao compounds of aniline, toluidine, xylidine, cumidine, and the nitro-derivatives of the same, amidoazobenzol, amidoazo-toluol, amidoazoxylol, and alpha and beta naphthylamine, benzidine, benzidine-sulphon, tolidine, tolidin -sulphon, diamidostilbene, and their snlphonic or carbonic acids, to flow into an aqueous solution of Bismarck brown.

The dyes obtained by the action ofdiazo or tctrazo compounds with triamidoazo-benzol or triamidoazotoluol, which have no sulpho or carbo acid group, are only soluble in alcohol and are rendered soluble in water by a sulphohating process, such as a treatment with sulphuric acid or othersulphating agents. These derivatives of Bismarck brown dye unmordanted cotton in a boiling soap bath containing alkali like those of tetrazo compounds a splendid brown color.

The processes next described herein serve to show how the dyes may be manufactured in practice according to my invention.

First example: 6.6 kilos of hydrochlorate of bcnzidinc are converted in the well-known manner into the muriatic tctrazo compound. The solution of the same is slowly poured, under'continuous stirring, into a solution containing one hundred kilos of Bismarck brown, (triamidoazo-bcnzol.) After having settled for about twelve h0urs,sodium acetateisadded. A brown insoluble precipitate is then formed,

(Specimens) representing the dye resulting therefrom, soluble in spirit. This is filtered and dried. In order to render soluble in water the thus formed dyestufl, about fifty parts, by weight, of the carefully-dried above-gained dye are introduced, while continually stirring slowly, into three times the quantity of fuming sub phuric acid containing about twenty per cent. of anhydridc at a temperature of about centigrade. The mixture thus obtained is allowed to stand at ordinary temperature until the action of the sulphuric acid is complete-i. 6., until a sample taken from the melt entirely dissolves in water containing ammonia. The materials are then poured into ice, and the new-formed sulpho-acid is filtered off and converted into its alkali salt by treatment with alkalies.

Second example: 8.5'kilosof naphthylamine sulphonic acid are converted in the well-known manner into the n'iuriatic diaao compound. The same is slowly poured, under continuous stirring, into a solution containing forty kilos of pure Bismarck brown, (triamidoazo-ben- 201.) After having stood for about twelve hours, the thus-formed muriatic mixture is then made alkaline by sodium carbonate and heated to boiling. A brown solution is formed, representing the formed (lye, soluble in water. It is filtered in order to separate from the base of Bismarck brown triamidoaZo-ben- 201, which has formed, but not taken part in the reaction of dye formation. Out of the filtered solution the dye is then isolated in the form of a. brown powder by salt-pressing and dryin Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. The process herein described of making new brown dye-stuffs, which consists in combining the salts of diazo compounds of aniline, toluidine, Xylidine, cumidine, and the hitro-derivatives of the same, amidoazo-benzol, amidoazo toluol, amidoazo -Xylol, alpha and betanaphthylamine, or their sulpho and carbo acids, and tetrazo compounds of benzidine, benzidincsulpho, tolidine, diamido-stilbenc,or their sulpho or earbo acids, with Bismarck brown, (triamidoazobenzol or trianoidoazotoluol,) snbstantiallyas hei'einbel'ore de- 1 to this specification in the presence of two witnesses.

scribed.

2. The rendering of the insoluble colors obmined as aforesaid soluble in Water by a sul- 5 phonating process, snbstantiallyas hereinhe .fore described.

In testimony whereof I have signed my name MARTIN HERZ BERG.

\Vitnesses:

ANTON KEUTER, I OTTO KRAUSE. 

